Secrecy performance of friendly jammer assisted cooperative NOMA systems with internal eavesdroppers

Abolpour, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1109/PIMRC48278.2020.9217169
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2020
  4. Abstract:
  5. In non-orthogonal multiple access (NOMA) systems, serving multiple users in shared resource blocks can allow untrusted users to overhear the messages of other users. In this context, we study a network consisting of a base station (BS), a near user and a far user, where the latter attempts to overhear the message of the former. The near user is a full-duplex (FD) node that can also act as a relay. Two operating scenarios are considered: 1) friendly jammer (FJ), where the FD node broadcasts noise for degrading the channel between the BS and the far user, while receiving data from the BS; and 2) friendly jammer relay (FJR), where, in addition to degrading the channel between the BS and the far user, the FD node relays the message of the far user. We investigate the secrecy performance of the network by characterizing the secrecy outage probability (SOP) in both scenarios. We obtain the exact SOP of the FJ case, and an approximation for the SOP of the FJR scenario, both expressed in closed-form. Numerical results confirm the accuracy of the analytical results. For a given BS power budget and power allocation to the users, it is demonstrated that the jamming and relaying powers are prominent factors to make the NOMA-FJR scheme superior to NOMA-FJ, as well as to conventional and cooperative NOMA schemes. © 2020 IEEE
  6. Keywords:
  7. Full Duplex ; Jamming ; Secrecy Outage Probability ; Secure Cooperative NOMA ; Secure NOMA ; Budget control ; Finite difference method ; Mobile radio systems ; Radio communication ; Analytical results ; Friendly jammer ; Multiple access ; Non-orthogonal ; Numerical results ; Power allocations ; Secrecy outage probabilities ; Shared resources
  8. Source: 31st IEEE Annual International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2020, 31 August 2020 through 3 September 2020 ; Volume 2020-August , 2020
  9. URL: https://ieeexplore.ieee.org/document/9217169